and Laboratory Methods. 1133 



Heidenhain's hsematoxylin, preceded by Bordeau red as a ground stain, were 

 used to stain material fixed in the fluids containing mercuric chlorid. The paper 

 is poorly illustrated by a series of reproductions of photographs. While photo- 

 graphy is a convincing method of illustrating points in gross histology, it has so 

 far proved a failure as a means of illustrating protoplasmic structures within the 

 cell. Lithographic drawings, or even diagrams, are much more satisfactory. 

 The work is a valuable contribution, as it adds much to our knowledge of the 

 origin and function of the cell plate. A. A. Lawson. 



Chicago. 



Wager, H. The Eye Spot of Euglena viridis. ^j^jg -^^ ^^^ ^^ interesting 



Jour. Lmn. Soc, 27 : 463-401, 1900. ... 



account of investigations on the struc- 

 ture and behavior of Euglena viridis. On the general structure of Euglena, Mr. 

 Wager gives nothing new, merely summarizing what is already known, but he 

 reports a striking feature in the vacuole system, namely, that the gullet is in 

 permanent connection with the principal vacuole or " excretory reservoir," as he 

 calls it. The eye spot he believes to be derived from chlorophyll, because the 

 action of its granules when in alcohol shows the same behavior as do the rusty, 

 red granules of Fucaceae, which are known to be derived from chlorophyll. His 

 most interesting discoveries were on the flagellum and its relation to the eye spot. 

 He found, by the use of osmic acid, that the flagellum passed into and was 

 attached to the excretory reservoir instead of terminating in the gullet. The 

 base of the flagellum is bifurcate, and on one of the limbs, in close (but not 

 organic) connection with the concave side of the eye spot, is a large oval swelling 

 or enlargement. Quoting Englemann's experiments on the behavior of Euglena 

 in a spectrum, he notes that the greatest gathering of the Euglenae is in the blue 

 end. Since the red pigment of the eye spot allows the blue rays of normal light 

 to pass, he suggests, tentatively, that there is possibly a definite stimulus exerted 

 by the blue rays upon the swelling, and hence on the flagellum. The other 

 hypothesis which he brings forward is that the eye spot merely causes a defi- 

 nitely unequal illumination of the sensory spot, and orientation follows. Further 

 experiments along that line would prove interesting. 

 Chicago. P. G. WrightSON. 



CYTOLOGY, EMBRYOLOGY, 



AND 



MICROSCOPICAL METHODS. 



Agnes M. Claypole. 



Separates of papers and books on animal biology should be sent for review to 



Agnes M. Clajrpole, Sage College, 

 Ithaca, N. Y. 



CURRENT LITERATURE. 



Furst, C. M. Haarzellen und Flimmerzellen. This investigation was carried out to 



Anat. Anz. 18: 190-203, iqoo. (6 fia;s. in , 1 ,- • , , 



text.) " show definitely the resemblances and 



differences between the so-called 



" hair-cell " and the ciliated cell. The material used was principally embryonic 



