﻿1 903 J CURRENT LIT ERA TURE 369 



is also a brief account of the marine laboratory at Misaki. The last essay is 

 by Professor MacMillan on The kelps of Juan de Fuca. There are seventeen 

 genera of kelps found in the Straits of Fuca, which is more than half of the 

 total number in the Laminariales. The habits and many of the structural 

 peculiarities of these are described in a popular style and illustrated with 

 several excellent figures. — B. M. Davis. 



Professor Mobius^ has published in book form his laboratory dire 

 tions for beginners. The book contains eighteen exercises, each intende 

 to occupy about three hours. Directions are given for making sixty-five 

 preparations, of which forty-two are phanerogams and twenty-three crypto- 

 gams. Almost without exception, the methods are those employed for exam- 

 ining fresh material, no microtome being used and almost no attention being 

 given to imbedding or staining. In this country subject-matter like that con- 

 tained in this book is usually presented by the teacher in the laborator} 



Charles J. Chamberlain. 



NOTES FOR STUDENTS. 



Monteverdes states, in a preliminary notice, that protochlorophyll is 

 not a yellow pigment, but is like chlorophyll in color and fluorescence. Etio- 

 lated leaves contain a certain amount of this substance, which begins to go 

 over into chlorophyll as soon as these are brought into the light. In light, 

 protochlorophyll is formed as fast as it changes into chlorophyll, and if green 

 plants are placed in darkness this process sometimes continues until the 

 green of the leaves is heightened by the accumulation of the former com- 

 pound. — Burton E. Livingston. 



MOLISCH*^ finds the phosphorescent bacterium, Micrococcus phosphoreus 

 Cohn, to be common and widely distributed instead of rare and sporadic as 

 generally supposed. It is found upon meats in refrigerators and cold-storage 

 houses, abattoirs, butcher shops, and kitchens into which flesh of slaughtered 

 animals is regularly brought. To secure this species for study it suffices to 

 dip a piece of fresh beef, veal, or pork into a 3 per cent. NaCI solution, to 

 lay it in a dish half immersed in the same solution and keep it at 9-12^ C. in 

 a moist chamber. 8g per cent, of beef tested in this way showed lumines- 

 cence. As the species dies quickly at the temperature of the human body it 

 probably cannot be injurious if eaten. A revised description is given with 

 illustrations.— C. R. B. 



^MoRius, M., Botanisch-mikroskopisches Praktikum fur Anfanger. 8vo. pp. 



* t 



IX -|- 2. figs, 12. Berlin : Gebriider Borntraeger. 1903. 



SMoNTEVERDE, N. A., Das Protochlorophyll und Chlorophyll. Bull. Jard. Imp. 

 Bot. St. Petersburg 2 : 181-1S2. 1902. 



^MoLiscH, Hans,' Ueber das Leuchten des Fleisches, insbesondere todten 

 Schlachtthiere. Bot. Zeit. 61' ; 1-18. figs, 5. 1903. 



