80 



THE AMEKICAN MONTHLY [April, 1881. 



the more universal use of this superfluous 

 domestic animal, in microscopical study. 

 — He deplored the seeming' preference 

 displayed by most authors of microscopical 

 literature for the rabbit and Guinea pig, 

 as proper material for experiment, and 

 proceeded to show how much the cat is to 

 be preferred to either of these comparati- 

 vely expensive animals for studying the 

 tissues and organs. He also gave a full 

 and complete description of the operation 

 of injecting, and the subsequent opera- 

 tions of hardening, cutting and mounting. 

 The paper was illustrated by a large 

 number of neatly mounted, injected and 

 stained sections of the tissues of the cat. 

 Other members of the Society also exhi- 

 bited mounts, bearing upon the subject of 

 the paper, and after the reading the even- 

 ing was occupied in examining and dis- 

 cussing the various objects. Mr. Mallory 

 was appointed to read the paper at the 

 next meeting. 



George C. Hodges, Secretary. 



San Francisco, 



At a meeting of this Society, held some 

 time ago, Mr. Hanks described " The 

 Clays in the Comstock Lode." The article 

 was quite long and possesses hardly suffi- 

 cient general interest to admit of its pu- 

 blication in this place. It is, however, a 

 valuable article for those who are interest- 

 ed in the study of the disintegration of 

 rocks, the condition of minerals in their 

 veins, etc., and copies can doubtless be 

 obtained from the author. 



Wellesley College. 



The regular meeting was held Monday 

 evening, February 38th. The President, 

 Miss Hayes, in the Chair. 



Miss de Veny presented a paper on 

 sponges. 



Miss Alice Gold also gave one on shells, 

 illustrated by shells and drawings. 



Professor Whiting spoke about snow- 

 crystals,illustrating her remarks by original 

 drawings, with some remarks as to the 

 supposed causes of crystallization. 



Under the microscope were exhibited : 



1. Sponge Spicules. Three different 

 slides. 



2. Microscopical shells displaying most 

 of the generic forms. 



3. Copper thrown from a volcano. 



4. Crystals of chlorate of potash. 



L. F. Clarke, Cor. Secretary. 



Exchanges. 



[Exchanges are inserted in this column without 

 charge. They will be strictly limited to mounted 

 objects, and material for mounting.] 



Well-mounted Histological and Pathological slides, 

 in exchange for other ^rsi-c/ass slides. 



LEWIS M. EASTMAN, M. D., 

 349 Lexington Street, Baltimore, Md. 



Well-mounted diatoms, in exchange for any well- 

 mounted slides or material, etc. 



W. H. CURTIS, Haverhill, Mass. 



For diatoms in situ on Algae, send mounted slide 

 K. M. CUNNINGHAM, Box 874, Mobile, Ala. 



For exchange : Mounted thin sections of whale- 

 bone, soapstone, serpentine, albite, feldspar, etc.;, 

 also opaque mounts of several very beautiful fossil- 

 iferous limestones. 



Rev. E. A. PERRY, Quincy, Mass. 



Fine injected specimens of kidney, tongue and 

 liver, also very fine slides of human tooth, prepared 

 according to the method of Dr. Bodecker, showing 

 the protoplasmic net-work between the dentinal can- 

 aliculi, in exchange for first-class histological and 

 pathological slides, or other good specimens. 



J. L. WILLIAMS, North Vassalboro, Me. 



Slides of hair of Tarantula., very curious ; also 

 crystalline deposits from urine, to exchange for well- 

 mounted slides. S. E. STILES, M. D., 



log Cumberland St., Brooklyn, N. Y. 



Well-mounted, typical Pathological and injected 

 Histological preparations, in exchange for other well- 

 mounted slides, Diatoms, Algae and Fungi preferred. 

 HENRY FROEHLING, 

 59 N. Charles Street, Baltimore, Md. 



Diatomaceae from Lake Michigan (Chicago water 

 supply), mounted or raw material : also diatoms from, 

 other localities, to exchange for well-mounted Diatom- 

 aceae or other objects of interest. B. W. THOMAS, 

 1842 Indiana Ave., Chicago, Ills. 



Lime sand, composed almost exclusively of micro- 

 scopic Foraminifera, to exchange for microscopic 

 material. H. A. GREEN, Atco, N. J. 



Polyzoa, Palates of Mollusca, Foraminifera, Sponge 

 and Holothurian-Spicules, Synapta-Anchors, Chirod- 

 ota-Wheels, Echinus-Spines, Minute Sea Shells, in ex- 

 change for Polyzoa, Foraminifera, Histological and 

 Pathological preparations, etc. Also, a quantity of 

 Sea Shells in exchange for Land and Fresh-Water 

 Shells. 



F. M. HAMLIN, M. D., Auburn, N. Y. 



To exchange, well-mounted Slides of Hair for 

 mounted or unmounted specimens of hair from the 

 rarer animals ; lists exchanged. WM. HOSKINS, 



208 S. Halsted street, Chicago, 111. 



Slides mounted from injected Frog's Gall-bladder, 

 Liver, Kidney, Stomach, Intestine and other parts, 

 exchanged for other good and interesting prepa- 

 rations. C. BLASDALE, M. D., 



Jericho, Queens Co., N. Y. 



