ZOOLOGY 577 



Thyro-parathyroidectomy and to Parathyroidectomy," Amer. 

 Jour, of Anat., vol. xxxi, No. 2, Dec. 1922). 



G. H. Parker has carried out a series of observations on the 

 mode of locomotion of the mollusc Strombus gigas (" The 

 Leaping of the Stromb, Strombus gigas Linn.," Jour. Expt. 

 Zool., vol. xxxvi, No. 2, Aug. 1922). He describes its mode 

 of progression as " leaping," an act which involves the forward 

 extension of the foot, its fixation in the substrate by its anterior 

 and posterior ends, and a vigorous muscular contraction 

 whereby the shell is thrown well forward, maybe as far as 

 half its length. 



'* The Reaction of Living Cells in the Tadpole's Tail towards 

 Starch, Agar-agar, Gelatin, and Gum Arabic," is the subject 

 of a paper by E. R. and E. L. Clark {Anat. Rec, vol. xxiv, 

 No. 3, Oct. 1922). Of the substances experimented with, 

 semi-cooked starch grains were found to exert a most intense 

 attraction on leucocytes, which surrounded the granules, 

 phagocytised the smaller ones, and in the course of a few 

 hours transformed them into substances unstained by iodine. 

 Boiled starch, agar-agar, gelatin, and gum arabic exerted a 

 less powerful attraction for phagocytes. The other tissue 

 cells showed no response to these introduced substances. 



Other papers of special interest : 

 Erhard, H., " Kritik von J. Loeb's Tropismenlehre auf Grund fremder 



und eigener Versuche," Zool. Jahr., vol. xxxix. No. i. 

 Fleming, A., and Allison, V. D., " Further Observations on a Bacterio- 

 lytic Element found in Tissues and Secretions," Proc. R.S., vol. xciv. 



No. B 658. 

 Hertwig, p., " Beobachtungen uber die Fortpflanzungsweise und die 



systematische Einteilung der Regenwurmnematoden," Zeit. fiir Wiss. 



Zool., vol. cxc, No. 4, 1922. 

 TiTSCHACK, E., " Die sekundaren Geschlechtsmerkmale von Gasterosteus 



aculeatus L.," Zool. Jahr., vol. xxxix. No. i. 



Zoological Technique. — In " Notes on Technique " [Anat. 

 Rec, vol. xxiv. No. 2, Sept. 1922), C. E. Buell describes a 

 method of preparing whole mounts of early embryos and also 

 a method of dissecting material embedded in paraffin wax. 



F. A. Mcjunkin, in the same journal, describes a method 

 of peroxydase staining with benzidin in paraffin sections of 

 human material. This is the sixth of a series of reports on 

 the mononuclear leucocytes of the blood. 



Of special interest, also, is the following paper : 

 Malone, E. F., " Sharpening Microtome Knives," Anat. Rec, vol. xxiv. 



No. 3, Oct. 1922. 



ENTOMOLOGY. By A. D. Imms, D.Sc, Institute of Plant Pathology, 

 Rothamsted Experimental Station, Harpenden. 



General Entomology. — A third edition of Folsom's Entomology 

 (Philadelphia, n.d., 502 pp., 5 pis., 308 figs.) has recently 



