472 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
The late Mr. Slack. — We greatly regret to report the death, on the 
16th June last, of one who was long actively engaged in the affairs of 
the Society. 
Henry James Slack, who was born on October 23rd, 1818, became a 
Fellow in the year 1862, and as early as the succeeding year was elected 
into the Council. From 1867 to 1877 he acted as one of the Secretaries 
of the Society, and in 1878-9 he was President. 
The following papers by Mr. Slack have appeared in the Society’s 
Journals : — 
Notes on the Yinegar Plant. (Trans. R. Micr. Soc., N.S. xiii. 1865, 
pp. 10-5.) 
On a Microscopic Ferment found in Red French Wine. (Trans. 
R. Micr. Soc., N.S. xvi. 1868, pp. 35-9.) 
The Patterns of Artificial Diatoms. (Monthly Micr. Journ., iv. 
1870, pp. 181-3.) 
On an Optical Illusion Slide : Cracks in Silica Films. (Monthly 
Micr. Journ., v. 1871, pp. 14-5.) 
On the Employment of Colloid Silica in the Preparation of Crystals 
for the Polariscope. (Monthly Micr. Journ., v. 1871, pp. 50-2.) 
On some Recent Investigations in Minute Organisms. (Monthly 
Micr. Journ., v. 1871, pp. 99-112.) 
On Crystalline Forms modified by Colloid Silica. (Monthly Micr 
Journ., v. 1871, pp. 115-6, 193, pis. lxxvii., lxxviii.) 
Optical Appearances of Cut Lines in Glass. (Monthly Micr. Journ., 
v. 1871, pp. 213-5.) 
The Silicious Deposit in Pinnularise. (Monthly Micr. Journ., vi. 
1871, pp. 71-4.) 
Micro-Ruling on Glass and Steel. By J. F. Stanistreet. With 
illustrative remarks by H. J. Slack. (Monthly Micr. Journ., vi. 1871, 
pp. 151-6, pi. xcvii.) 
The supposed Fungus on Coleus Leaves; and also Notes on 
Podiosoma fuscum and P. juniperi. (Monthly Micr. Journ., vii. 1872, 
pp. 217-21, pi. xviii.) 
On the Structure of the Valves of Eupodiscus Argus and Isthmia 
enervis , &c. (Monthly Micr. Journ., viii. 1872, pp. 256-9, pi. xl.) 
On Organic Bodies in Fire-Opal. (Monthly Micr. Journ., x. 1873, 
pp. 105-6, pi. xxvii.) 
On certain Beaded Silica Films artificially formed. (Monthly Micr. 
Journ., xi. 1874, pp. 237-41, pis. lxiii. lxiv.) 
Some Remarks on Bucephalus polymorphus, by J. Badcock ; together 
with translations from papers of Von Baer, Lacaze-Duthiers, and 
A. Giard on B. polymorphus and Haimeanus, by H. J. Slack. (Monthly 
Micr. Journ., xiii. 1875, pp. 141-6, pi. xcviii.) 
On Angle of Aperture in Relation to Surface Marking and Accurate 
Vision. (Monthly Micr. Journ., xiii. 1875, pp. 233-9.) 
Perforating Proboscis Moths. (Monthly Micr. Journ., xiv. 1875, 
pp. 235-6.) 
Bastian and Pasteur on Spontaneous Generation. (Monthly Micr. 
Journ., xvi. 1876, pp. 165-8.) 
Microscopic Aspects of Krupp’s Silicate Cotton. (Monthly Micr. 
Journ., xvii. 1877, pp. 236-8, pis. clxxx. and clxxxi.) 
