1902 MiICROSCOPICAL JOURNAL. 15 
these leaflets is to lead the teacher to cultivate the faculty 
of observation, to trace cause and effect, and to become 
acquainted with life-histories and processes of evolution 
and development. If students acquire the habit of ob- 
servation, they will quickly learn to think, and an added 
interest will be imparted to their studies by bringing 
them into actual touch with the secrets which the mi- 
croscope can alone reveal. 
It would seem almost a pity to give the scholars a 
compound microscope at too early astage; pages could be 
written on the unnoticed.structure which can be seen 
with a pocket lens, and it would be well that the work 
should be graded, and that before a compound micros- 
cope is used the worker should have acquired a facility 
with the pocket lens. 
There is no doubt that this new study will receive en- 
couragement, will be appreciated by the scholars and grow 
to large dimensions, and it will be for all the microscope 
makers to anticipate the requirements by providing suit- 
able instruments of sound but plain construction, and at 
a sufficiently moderate price ; in fact, in a degree the suc- 
cess of the scheme so far as microscopy is concerned 
depends on the willingness of makers to do their part. 
It is impossible to foretell the influence which snch teach- 
ing may have onthe future of the country scientifically, 
and it is not improbable that it will in time to come bring 
an army of workers into the ranks of microscopists, and 
serve to re-create the interest which it is considered by 
many is dormant among amateurs at the present time. 
Focussing ATTACHMENTS TO PuHoto-Micko. CaMERAS.— 
Many ideas have been formulated for making an effective 
connection between the microscope fine adjustment and 
the long rod which actuates it from the end of the photo- 
micrographic camera. These have consisted principally 
of an endless band passing round the milled head of the 
microscope and a similar head attached to the rod of the 
