NOTES AND QUERIES. 247 
NOTES AND QUERIES. 
Mr. Botton’s Srup1o.—Now that the long winter evenings 
are approaching and microscopists can no longer roam abroad in 
search of organisms, we would advise a closer acquaintance with 
the denizens of this studio. In jars, aquaria, wine glasses, bottles, 
&c., at 57, Newhall, Birmingham, may be found Lophopus crystal- 
linus, Cristatellamucedo, Plumatella repens, Stephanocerus Eichhornit, 
and many others, ready to be sent away at a moment's notice. 
How TO COLLECT THE ORGANISMS FROM TowN WaTER.—Make 
a small bag of fine cloth about 3 inches in diameter and six inches 
long, open at both ends. Attach the lower end to the neck of a 
small wide mouth bottle and the upper end to the tap of the water 
supply. Let the water run for an hour or more, when the organ- 
isms will be found in the bottle, from whence they may be taken 
for examination. 
FULL sizeED BopiEs.—The student will do well to consider what 
advantage (if any) is gained by the purchase of a microscope with 
a tube of small diameter. The dealer has said more than once 
that such microscopes as illustrated on p. 216 could be cheaply 
made ¢f there were a demand for them, ‘This is hardly a correct 
view of the case; there are very obvious reasons why these small 
tubes continue to be made, and in order to aid those who may 
wish to purchase a full size body at the ordinary price we shall be 
glad to put our readers in communication with a maker who will 
take the following sizes as his standard :— 
Inside diameter of draw-tube to admit eyepieces... 1.3 inches. 
Inside diameter of substage fitting 1.5 inches full. 
When made to the above standards, the eyepieces and accessories 
of any maker may be used. If an adapter be required, it may 
easily be constructed of paper or cardboard. If microscopists 
would buy a large tube and manufacture their own adapters they 
would be doing more to bring about a universal guage for eyepieces 
and substage fittings than they on first thought imagine. 
Cotuin’s HisrotocicaL Microscope.—Mr. Collins writes: “I 
have to thank you for naming my Histological microscope in your 
Journal for this month; but wish to point out that it has the 
advantages you mention. The body is capable of receiving the 
full-size eyepieces and apparatus of my largest microscopes.” 
Norr.—When writing the article on page 215 we had overlooked 
the fact that the above microscope was possessed of a full-sized 
body. We regret this the more as the Histological stand would 
have been brought prominently into notice, wishing as we do to 
