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piratory organs, discovered by Geoffrey Saint Hilaire, which establish a connexionbetween the posterior nostrils and the cavity of the larynx.

We are entirely without notions concerning the abdominal folds, which, in thiskind, take the place of the pouch, in a certain degree, and know nothing of the mo-difications these folds pass through in the different epochs of gestation.

Anthropology .— The countries to which these instructions are adressed to aredoubtless among those where naturalists can collect the greatest number of inte-resting facts for this branch of natural history, formerly neglected and to whichhas been given, for some years past, an impulse worthy of its high importance.In Mexico and in the United States three of the principal human races are foundtogether; the race peculiar to America , the Caucasian race from different countriesof Europe, and the Ethiopian carried over in its train. All these races, cross-breed,and from the crossing of the half-breeds with them and each other, result manycurious combinations, whose scientific study is of the highest interest.

It has unhappily been, for a longtime, as difficult as it is important. If theplain and marked characteristics of the two animal species often disappear; if askilful analysis, enlightened by direct comparison with analogous objects, canalone discover them, how can the anthropologist size between two neighbouringtypes, express and transmit by description, light, fleeting distinctions, some timesinvisible for him, who has not the habit of observing them?

Three inventions or new application, made almost simultaneously, have happilyremoved part of the great difficulties, and opened a new era in the natural his-tory of man; the daguerreotype, which fixes and engraves with geometrical pre-cision, the general shape of the body and the features of the face; the Cephalo-meter of Antelme M. D. which measures and sketches with a process almost as,exact, the dimensions and forms of the head, and enables one to determine, asnearly as possible, the mean dimensions and typical form of the head of a peoplethe sex and age: in fine, the perfection andhappy application to anthropology of theprocess of moulding, performed directly, or by the aid of the ingenious physono-type of M. Sauvage; a process by which the whole head and, if necessary, themembers of the body are preserved and placed before our eys.

We have the hope that, with the aid of the Daguerreotype and physionotype,the american naturalists will enrich anthropology with results of great interest,by photographic portraits, such a those presentedto the Academy by M.Thiesson;by mouldings to be added to the fine collection made by M. Uumoutier, now inthe museum ; by colored drawnings, by descriptions and measures, they wouldtransmit us information of extreme precision, true scientific elements, to whichthe committee would attach the greatest importance.

We think it our duty to direct the researches of the american naturalists, notonly to the different varieties of the American race, but also to the half-breeds,yet so little known, of both, and, also, to the offspring of the crossing of thefirst with the Caucasian race. We request them, as soon as they shall have de-termined exactly the physical characteristics of these difficult varieties, to ne-glect no information that may enlighten us as to their intellectual capacity.

We would, likewirse, entreat these gentlemen to specify exactly and express bycolored drawnings done with care, the different statesof the hues of the American races a^id half-breeds, from the moment of theTr birth up to the period that theyarrive at the normal color of their kind.

We would desire them, besides, to collect, of these same races, their half-breeds,and the white race, more minute particulars than as yet obtained, on the durationand difficult phases and epoch of puberty.

Chemistry and agriculture. — These are the principal forms that allow the useof Caoutchouc without dissolving it and without altering the heat

i° Straight tubes; elbowed tubes ; tubes in T of different thickness and dia-meter ;

2° Full cylinders, to be cut in France as wanted;

3° Rectangular plates, cut in France ;

4° Caps to cork bottles and flasks.

It would be desirable to examine, in an economical point of view', the questionof the preparation of preserved sugar, transportable to France , and giving, by asimple preparation, elastic caoutchouc.