704 The American Naturalist. [August, 
I believe that what Mr. Green now calls Mytilaspis gloverii var. 
pallida is a distinct species, as he at first held. Mr. Alex. Craw has 
found on variegated Podocarpus from Japan a form which I propose 
to call M. pallida var. maskelli, because it was discussed by Mr. Mas- 
kell in Trans., New Zealand, Inst., XX VII, p. 46. The scale is too 
broad for gloverii, but narrower than citricola; it is not far from the 
color of citricola, not very pale as in typical pallida, though often whit- 
ish at the broader end. There seem to be but four groups of ventral 
glands, caudolateral four, cephalolaterals six.—T. D. A. CocKERELL. 
Section Cutting and Staining.’—This is intended primarily for 
students and practitioners who need a brief introduction to the ways 
of the microscopist. It briefly describes the necessary apparatus, and 
the various processes to which tissues are subjected for histological pur- 
poses. In many respects it may be said to be fairly up to date, in 
others, as for instance, in the case of bichromate of silver methods in 
neurology, it is not. Formol is given as a histological reagent, but un- 
fortunately it is given as formal, which is a synonym for methylal, as 
has been previously pointed out in these pages, and as any one may 
readily see by consulting German works on organic chemistry or by 
consulting Gould’s “ Students’ Medical Dictionary ”* (1896, Phila.). 
By reason of priority, and by reason of its expressing the probable 
relations of the formaldehyde to the water in the so-called 40 per cent. 
solution, formol is the proper word to use for this liquid. But as the 
term Formalin has been forced into use in the commercial world and 
will probably stay in spite of efforts to supplant it, one may as well sub- 
mit and use the word that one must employ in buying one’s reagents. 
It is obvious, that, if one calls for formal, one will get methylal. 
Cambridge Natural History, Volume V.’—The high stand- 
ard of this series as a reliable, popular scientific work is maintained in 
this volume. Mr. Sedgwick contributes a paper on Peripatus, giving 
its habits, manner of breeding, anatomy, development, and a summary 
of distribution, the latter point being illustrated by a map. Mr. Sin- 
clair treats of Myriapods in the same comprehensive manner, and in- 
cludes a brief account of fossil forms and their distribution. Mr.Sharp 
gives an introductory sketch of Insects embodying the latest observa 
T Section Cutting and Staining. W.S. Colman. 12 mo. 160 pp. 
8 Or any one of several other Medical Dictionaries. i 
? Cambridge Natural History Series, Vol. V. Peripatus, A. Sedgwick. Myria- 
pods, F. G. Sinclair. Insects, D. Sharp. London and New York, 1895. Mae- 
millan & Co. $4.00. 
