488 J. S. Gamble and D. Prain— Genus of Orobanchacese. [No. 4, 



It will much facilitate operation if between 0'2 to 015 g. be taken 

 for purposes of analyses. In the case of the dark brown variety of 

 the haloid it is advisable to examine it carefully with a magnifying 

 glass as inside its thick crust minute globules of mercury are often 

 found enclosed. 



From the foregoing inquiry it is evident that when the residue in 

 the flask after the interaction of mercurous nitrite and ethyl iodide is 

 heated in a tube between H^O^IO*, mercurous iodide sublimes off. 

 The compact mass of crystalline tablets thus obtained varies in all 

 gradations of tint from lemon-yellow and orange-yellow to orange- 

 brown and even dark brown. 



Chemical Laboratory, Presidency College. 



XIX. — Description of a new Himalayan genus of Orobanchaceee. — 



By J. S. Gamble, M.A., F.R.S., and D. Prain. 



[Received 7th August ; Eead 5th October, 1900.] 



GLEADOVIA Gamble & Prain. 



Calyx tubulosus, parum inflatus limbo sequaliter 5-lobo. Corollse 

 tubus parum incurvus, labium posticum incurvo-erectum concavum mi- 

 nopere emarginatum, anticum brevius suberectum lobis 3 subaequalibus 

 erectis. Stamina inclusa filamentis apice in connectivum conicum dila- 

 tatis, antherarum loculi aequales adnati basi divergentes et mucronato- 

 aristati. Ovarii placentae 4, per paria approximate, medioque con- 

 fluentes ; stigma dilatatum late aequaliter 2-lobum. — Herba parasitica 

 carnosa rhizomate incrassato, squamis ovatis suffulta. Flores densius 

 paniculati, pedicellati, 2-bracteolati. Color pallide purpurea. — Species 

 singula, Himalaica. 



The interesting plant for which we propose the above generic des- 

 cription was discovered in Jaunsar in 1898 by the officers of the 

 Imperial Forest School, Dehra Dun ; we dedicate it to Mr. F. Gleadow, 

 who was the first actually to find it. 



Our plant has all the facies of a Ghristisonia, but cannot be referred 

 to that genus because both anther-cells are perfect, because the corolla 

 is very markedly 2-labiate in place of being sub-equally 5-lobed, and 

 because the two stigmatic lobes are equally large. 



The nearest ally of our plant seems to be the American genus 

 Conopholis Wallr., with which it agrees as regards corolla and, except 

 that they are not exserted, as regards stamens, but from which it differs 

 in having an equally 5-lobed calyx and a 2-lobed stigma. From 



