^8 The West America^i Scienlist. 



HO URS FOR VISITORS TO THE LICK OB- 

 SER VA TOR Y. 



The Observatory buildings will be open to visitors during 

 office hours, every day in the year. Upon their arrival, visitors 

 will please go at once to the visitor's room and register their 

 names. 



An hour or so can be profitably occupied in viewing the vari- 

 ous instruments, and the rest ot the stay can be well spent in 

 walks to the various reservoirs, from which magnificent views of 

 the surround. ng country can be had. At least an hour and a 

 half of daylight should be allowed lor the drive from the Summit 

 to Smith Creek. There areola lioicl-accomodations at the Summit. 



For the present, visitors will be received at the Observatory 

 to look through the great telescope every Saturday night, be- 

 tween the hours of 7 and 10, and at these times only. 



Whenever the work of the Observator will allow, other tele- 

 scopes will also be put at the disposition of visitors on Saturdays 

 between the same hours (only). 



At 10 p. M. the Observatory will be closed to visitors, who 

 should provide their own conveyance to Smith Creek, as there 

 is no way of lodging them on the mountain. 



It is expected by setting apart these times for visitors (which 

 allow freer access to the Lick Observatory than is allowed to 

 any other observatory in the world) that all interested may be 

 able to arrange their visits in conformity to them; and that the 

 remaining hours ot the week will be kept entirely uninterrupted, 

 in order that the Astronomers may do the work upon which the 

 reputation and the good name of the Observatory entirely de- 

 pends. — Edward S. Hoiden, Director. 



PROCEEDINGS OF SCIENTIFIC SOCIETIES. 



San Francisco Microscopical Society — April id, 1889. 

 Mr. A. B. Leckenby spoke briefly of the difficulties often experi- 

 enced by the tyro in manipulating the numerous forms of insect 

 life for slide-mounting and lantern projection, and described the 

 method pursued by him as embodying the result of many years 

 of patient application to the subject. Starting with the coleop- 

 tera, or beetle lamily, the first step is to devitalize them quickly 

 and while they are in flight, which the gentleman accomplishes 

 by dropping them through a long glass tube into boiling water. 

 The elytra and wings are by this means immovably fixed in the 

 extended position, and remain unaltered durmg the subsequent 

 operations. The body of the insect is then injected hypoder- 

 mically with a strong solution of caustic potash and allowed to 

 remain three or four hours, then transferred to a glass slip and 

 gentle pressure applied, when the vicera and other tissues form- 



