and Laboratory Methods. 1341 



of identification of species, while abundant illustrations facilitate the recognition 

 of diagnostic characters. The fact that this monograph is issued in the Report 

 of the U. S. National Museum makes possible a much wider distribution to the 

 public than was given Professor Cope's earlier bulletins upon the Batrachia. It 

 is to be hoped that the monograph of the turtles, in preparation by the late 

 Professor Baur, will soon be issued to complete the manual of the North 

 American Reptilia. c. a. k. 



Sayce, 0. A, A Method of Preserving Crusta- Suppleness in dried specimens of such 



cea. Victorian Nat. 17: 71-78, igoo. . , ^1 /^ ^ 



-^ ^ animals as the Crustacea is a great 



desideratum, especially in laboratory demonstrations. Mr. Sayce secures this and 



also preserves to a considerable degree the natural appearance of the animal, 



and at the same time obviates preservation in fluids, by the following treatment: 



The specimens, either fresh or from TO per cent, alcohol, are immersed for some 



days, ten will suffice for crayfish, in a fluid which, in metric equivalents, has 



approximately this formula : 



Glycerin -- .-... 375 c. c. 



Methylated spirit ---------- 250 c. c. 



Water ------------ -250 c. c. 



Corrosive sublimate --------- 0.5 gm. 



Slight punctures in inconspicuous parts of the carapace will facilitate pene- 

 tration. After thorough soaking in this fluid, the specimens are removed and 

 drained and allowed to dry. They can be stored in boxes or wrapped in water- 

 proof paper. To avoid too much drying and also to prevent the accumulation 

 of moisture due to hygroscopic action of the glycerin, specimens should be given 

 a thin coat of gelatin and then immersed in 10 per cent, formalin for a few 

 minutes. This hardens the gelatin, renders it impervious to water, but does 

 not interfere with its transparency. c. a. k. 



NORMAL AND PATHOLOGICAL HISTOLOGY. 



Joseph H. Pratt. 



Harvard University Medical School, Boston, Mass., to whom all books and 

 papers on these subjects should be sent for review. 



~ .. . ,. , ,. T, • , , ,1, The circumscribed areas of acute par- 



rujiDami. Leber die Beziehungen der Myo- '^ 



carditis zu den Erkrankungen der Arterien- enchymatOUS myocarditis are always 



wandungen. Virchow's Archiv., 159 : 447" associated with the narrowing or oc- 

 490, 1900. _ _ ° 



elusion of the small arterial branches 



which supply them. This is the only form of myocarditis which bears a 

 close and constant relation to sclerosis of the coronary arteries. In fibrous 

 myocarditis sclerotic changes are found in the course of the coronary arteries, 

 but not usually in immediate connection with the fibrous areas. 



Arterio-sclerosis, without complete occlusion of the vessels, leads to 

 disturbances of nutrition in quite large portions of the muscle-wall. Degenera- 

 tion of the muscle-fibers results, followed by a reparative growth of connective 

 tissue. 



