1899] MICROSCOPICAL JOURNAL. 223 



tral side ends just before the cloaca, and to call the whole 

 tract, from the gap in the trochal wreath to the cloacal 

 orifice, dorsal. In this way the cloaca and all other or- 

 gans will appear in the usual position which obtains 

 throughout the class. 



The flat ribbon-like ovary (ov) is suspended between 

 the body wall and the stomach (st) and opens by a thin 

 walled oviduct in the cloaca. The lateral canals (1. c.) are 

 attached on each side close to the walls of the sphere, 

 and appear to open in a small contractile vesicle (c. v); 

 their apparent connection with the nerve threads of the 

 lateral antennae (1. a.) does not appear to be real or or- 

 ganic, but only accidental. The red eyes (e), with crys- 

 talline lenses, are present, situated on the ciliary wreath 

 in a line at right angles to the mouth. The nervous sys- 

 tem is very distinct, and can be beautifully studied in this 

 animal ; the brain ganglion (br) is seen just above the 

 mastax, sending long and short nerve-threads (n) across 

 the body cavity to the dorsal and lateral antennae, to the 

 ciliary wreath, the eyes, and all other organs. Two long 

 and two short gastric glands are attached at the apex of 

 the stomach, and four or five pairs of small muscular 

 bands (m. b.) are arranged just below the ciliary wreath, 

 by means of which only this zone can be slightly con- 

 tracted. In size and shape it is like a young volvox glo- 

 bator, with perfectly transparent integument. — Q. C. 



EDITORIAL. 



Adulteration of Insect Powder. — Two out of five brands 

 of insect powder examined by E. J. Huber, were found to 

 be adulterated with ground oxeye daisy flowers. Experi- 

 menting with this adulterant, he found it to be entirely de- 

 void of insecticide properties. 



A "Double Serum."— Dr. J. Honl (Wien. Klin. Rund.) 

 has undertaken to produce a "'double serum" for the treat- 



