. Science-gossip . - an eminentmounter, absolutely worthless, owing to thepreserving substance havTng perished. As someproof of the trustworthiness of Canada-balsam,I may mention that I have some slides in mycollection prepared by the elder Topping quiteforty years ago, which are as good now as the dajthey were purchased; and the accompanjing photo-graph of the ovipositor of the green saw-fly, whichwas taken from a slide (likewise mounted inbalsam) prepared upwards of 15 years, will alsoftumsh ocular demonstration as to its value as apreservative. Perhaps some of my brother micro-scopists will
. Science-gossip . - an eminentmounter, absolutely worthless, owing to thepreserving substance havTng perished. As someproof of the trustworthiness of Canada-balsam,I may mention that I have some slides in mycollection prepared by the elder Topping quiteforty years ago, which are as good now as the dajthey were purchased; and the accompanjing photo-graph of the ovipositor of the green saw-fly, whichwas taken from a slide (likewise mounted inbalsam) prepared upwards of 15 years, will alsoftumsh ocular demonstration as to its value as apreservative. Perhaps some of my brother micro-scopists will give us the benefit of their experience.—/. C. Welb, , 32, HensU-^e Road, photograph shows the object to be inperfect condition. Ed. SCIENCE-GOSSIP. 49. Variable stars need persistent and carefulwatching. During July the following stars of thisclass are well placed for observation ;— CONDUCTED BV FRANK C. DENNETT. Sun Moon Afercuyy. Venus Jupiter .Saturn .Uranus . Neptune. 3rd Qr, ... July 31st Qr 17 Rises, • 349 •? ? 3-58 .. . • 4-23 .Rises. • . , • 9-43 •Souths, •?. •? . .. .. •? .. .. .. .. .. , - • .. ••. .. 7-52 .. ?? Sets, • 748Souths. • 4-39 ?• 9-35 ?• ?• 4-34 •? SemiDiameter. .. 4 2 .. .. 3 3 •? ,. 2 7 .. .. 2 5 .. 4 9 4 9 3 5 3 6 3 8 4 o 14 4 8 o I 9 I 9 Position at Noon. .7-25 . .S45 .Siis. 90 5-14 • . ? 845 . 634 • .1443 ?15-13 . Dec.
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
