ii4 



HA RD WICKE'S SCIENCE- G OS SIP. 



acquainted with the ordinary use of the microscope can 

 successfully turn out micro-photos after a very little 

 practice. The apparatus sent out with Mr. Tylar's 

 Micro-photographic Camera is accompanied with a 

 prettily got up brochure containing full instructions 

 how to use every appliance included. This has been 

 written purposely for beginners. Naturalists, as a 

 rule, are not people of enormous incomes or 

 bloated fortunes, and to them this twenty-seven and 

 sixpenny fully equipped instrument, which will enable 

 them to photograph microscopic objects, is a decided 

 help-meet, and cannot fail to intensify their quiet 

 delights in natural history pursuits and studies. The 

 camera itself is an elegantly and artistically turned out 

 bit of work, made of polished mahogany. Mr. Tylar 

 has decidedly made a hit in bringing out at so 

 moderate a price, an instrument which hundreds of 

 ardent but impecunious microscopists have long 

 required. 



Watson's Illustrated Catalogue. — To a 

 microscopist and naturalist, the perusal of such a well 



Fig. 68.— This microscope lamp is fitted with a metal chimney, 

 having extra large body allowing of free combustion, and 

 fitting to receive ordinary 3 in. by 1 in. slips. The trouble 

 of broken glass chimneys is thereby avoided, and as the 

 inside is blacked, double reflections are prevented. The 

 container being very flat, the light can be brought down 

 very near to the table ; the stopper is built up from the 

 reservoir, thereby obviating the unpleasant leaking usually 

 found in flat lamps. The supporting bar being square, the 

 lamp is very rigid and has no tendency to swing round as on 

 a circular tube. It burns for ten hours. Best paraffin oil 

 should be used. 



got up catalogue as the present is as enjoyable as a 

 first-class catalogue of rare and valuable books is to a 



bibliophilist. If he cannot afford to purchase them,, 

 nevertheless he is happy that there are such things in 

 existence, ready for him, if he only had the money. 



Fig. 69.— Achromatic Condenser. This is specially designed 

 for use in photo-micrography, but it is also efficient for 

 visual work. It does the work of the Abbe Illuminator, and. 

 transmits a rather larger aplanatic cone of light. It is 

 strongly recommended where critical photographic work is 

 to be done. It may be used with the highest power objec- 

 tives, and by removing the top lens can be used with the 

 lowest powers. The new Schott glass is employed in its 

 construction. 



Fig. 70. — New Aplanatic Bull's Eye or Stand Condenser (as 

 suggested by Mr. E. M. Nelson). This form is designed to 

 minimise the large amount of spherical aberration given by 

 ordinary stand condensers; with it a considerably increased 

 brilliance of illumination is obtainable. It is composed of 

 two lenses. Its use is specially indicated in photographic 

 work, and it will be found to not only shorten the exposure, 

 but materially improve the image. 



Messrs. Watson & Sons, 313, High Holborn, have just 

 sent out their " Illustrated Catalogue of Microscopes, 

 Objectives, and Accessory Apparatus." The latter 



