ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
149 
of the micrologist in his researches must he mentioned. His outfit is 
extensive and novel. It includes the best known Microscopes and a 
well-constructed incubator with heater and thermometer, numerous 
test-glasses, beakers, filters, acids, alkalies, deep-coloured dyes, and a 
good supply of prepared cotton. 
In studying the life-history of his microbes he will require a well- 
supplied commissariat. He must be a professional caterer and a boun- 
tiful feeder. He must have fluids, semi-fluids, and solids, broths of 
various meats, peptonized food, the serum of blood a la Koch , and 
Pasteur’s favourite recipe with the French refinement : Recipe, 100 parts 
distilled water, 10 parts pure cane-sugar, 1 part tartrate of ammonium, 
and the ash of 1 part of yeast. Among the substantial must be found 
boiled white of egg, starch, gelatin, Japan isinglass, and potato, the last 
from South as well as North America.” 
A Query. — As “ Novice ” will perhaps get the best advice by means 
of our Journal we hasten to give his questions the widest publicity we 
can : — “ I am thinking of starting a street exhibition with four Micro- 
scopes (two by Beck and two by Watson). Will some kind reader 
please tell me which objectives I should use to please the public most 
— 1/4, 1/2, 1, 2, or 3 in. ? Also please tell me of a few good mounted 
objects that will please them as well ; and which objectives I should use 
to get the best result when examining a frog’s foot. And do you think 
there is a living of, say, 35s. per week by going from town to town? 
Any information on the above will be gladly received by — Novice.” 
* Eng. Mech., lii. (1891) p. 471. 
