EXTRACTS OE PROCEEDINGS. 
xl 
in their efforts to bring order out of what otherwise would be such 
confusion. 
SCIENTIFIC COMMITTEE. 
Sir J. D. Hooker, C.B., Pres. B.S., in the Chair. 
Van Bol Tulip. —Mr. Elwes exhibited a specimen of the purple 
Van Bol Tulip, the peculiarity of which was that it appeared 
never to increase by offsets. A well-known Dutch horticulturist 
had given him three plants taken from his nursery where he had 
had two rows of them as long as he could remember—never more 
—they command no sale. He thought it was probably a Persian 
Tulip. 
Diseased Bulbs.— The following communications were read, re¬ 
lating to the bulbs forwarded by Mr. Atkins on a former occasion:— 
“ The affection on the bulbs of Tulip and corms of Crocus is, as 
far as I am aware, undescribed, It is caused by one of the nume¬ 
rous forms of Sclerotium, but at present it is quite impossible to 
say what may be the perfect form. The Sclerotium resembles 
externally S. complanatum , but the structure is quite different, as 
is also that of Bhizoctonia crocerum, of which at first sight it 
seemed possible that it might be a form. The external tissue con¬ 
sists of irregular darker cells, beneath which are threads, more or 
less branched, resembling those of a mucor, mixed with hyaline 
cells much larger than the former. I have myself been able to 
trace to its perfect form the little gunpowder-like Sclerotium which 
is so destructive to Onions ( Journ . B. Hort. Soc. iii., p. 98, f. 1-5.) 
Much information on the subject will be. found in Leveille’s memoir 
in the Annales des Sciences Naturelles , October, 1843. I have 
placed the specimens on damp sand under a bell-glass, and should 
further development take place I will not fail to report it.— M. T 
Berkeley 
“I received for examination bulbs of Crocus, Snowdrop, and 
Cyclamen. In none could I find fungoid disease to account for the 
premature decay. In Snowdrop and Crocus there are one or two 
small black flattened Sclerotia, but these only on the outer coats. 
In Snowdrop one of the bulbs had the external fleshy coat per¬ 
meated everywhere by mycelium, which on being kept moist and 
covered developed threads of Penicillium glaucum , the consequence 
and not the cause of decay. The decayed leaves of Cyclamen 
