Tue Microscope. 133 
Cerres: 
To the Readers of THE MICROSCOPE: 
At the annual meeting of the American Society of Micro- 
scopists, to be held in Rochester, N. Y., commencing August 19, 
1884, one entire session is to be devoted to practical illustrations 
of the methods of work by experienced microscopists. Tables 
will be arranged in a room or rooms provided for the occasion, 
which will be occupied by experts in microscopical work. 
Every experienced worker of the Society is earnestly solic- 
ited to write at once a short description of any of their own 
satisfactory methods of mounting or of preparing material or 
of making accessories for the microscope or of anything of gen- 
eral interest in connection with microscopical work and to send 
it as soon as possible to the undersigned. These descriptions 
are wanted at the earliest possible date so that they may be 
sent to the Publishing Committee to be examined before the 
next meeting. Address EK. H. Grirritu, A. M. 
Fairport, N. Y. 
—_—__—~< ¢ >—____—__ 
DEAR DOCTOR: 
Tis like sending “coals to Newcastle” to send you the 
skin of a silk worm, but it may be a new process; it certainly 
saves tedious dissection. A worm is soaked in acetic acid for 
ten days or more, and then opened catefully with scissors from 
anus to mouth and washed in water. The respiratory appa- 
ratus, trachea, &c., all seem perfect for mounting. I soak first 
in weak alcohol, then strong, follow with oil of cloves, then tur- 
pentine, and finally mount in balsam. 
Yours, &e., K. E. Jackson. 
| Mr. Jackson states in a later communication, that he has 
heard his process is not a newone. This does not invalidate the 
method, however. | 
brah ee oe 
‘“‘ T find an interesting study for the microscope in tartar from 
the teeth dissolved in warm water. Would like some of your 
readers to investigate and report. I use a one-inch eye piece, 
and a one fourth objective.” 
