THE MIcROSCOPE. ole 
erable, though a round one will answer. I bored four holes op- 
posite each other, one inch above the bottom, and about three- 
eighths of an inch in diameter, and enlarged the openings in a 
direction parallel with the length of the bottle until within an 
inch of the neck. Over these four oblong apertures I cemented 
fine bolting silk or other desirable material, with shellac, and 
when dry the bottle was ready for use. To those not having the 
tools needed for drilling glass, I would recommend a small tin 
can or box, such as that in which Coleman’s mustard is sold, 
or the common round pepper-box obtainable from the grocery 
stores, the lid making a good coarse strainer. In fact this form 
of collecting implement, either from can or box, will allow of 
many modifications to suit the taste of the investigator, or the 
material on hand. 
In working with it, as with all other forms, the currents of 
water passing through the meshes of the strainer will cause the 
fine debris to collect on the inside, which in this case is easily 
kept clean with a small brush, a piece of wood or a stalk of grass. 
The concentrated material will be found at the bottom of the 
vessel, and can be transferred to another small bottle carried for 
the purpose. 
I have found this form of collecting implement very conven- 
ient; so much so, indeed, that my old Wright bottle stands on 
the shelf neglected. The small one and a few homeopathic 
vials have supplanted it. And they have the advantage of being 
portable in the coat pocket. 
Until recently, in using either bottle, I always carried a small 
tin strainer to keep out coarser materials, but since writing the 
foregoing I have experimented with a tin mustard can, “ Cole- 
man’s,” by cutting two oblong openings in the broadest sides, 
cementing the bolting silk over the apertures, and perforating 
the lid with holes about one thirty-second of an inch in diame- 
ter. On one of the narrow uncut sides I have soldered a brass 
ferrule with a thread cut inside, while on the end of my walking 
cane is also a2 small brass ferrule with an external thread to fit 
that on the can. This I find very useful for reaching out from 
the shore. 
For collecting the Entomostraca this is the ne plus ultra of im- 
plements, and when away from home, with the small can and 
a few little bottles in my pocket, and with a harmless looking 
