160 MICROSCOPICAL MEMORANDA. 



noctiflora, the whole surface becomes covered with separate tubes, very 

 similar in form, but destitute of spiral fibre, and terminating in a minute 

 pore, from which streams of mucilage are discharged. 



Those of several species of Barleria, Lepidagathis, &c. are entirely 

 covered with long tapering simple hairs, which expand in water, and 

 like the rest are enveloped in a thick coat of mucilage. 



In all the foregoing species the hairs occupy the entire surface of the 

 seed, and are usually directed towards its apex, though they occur often 

 most abundantly at the edges ; in others they are only found attached 

 to a marginal ring of a different texture from the rest of the seed. 

 This is the case in Strobilanthus lupulina, Blechum Brownii, and Ruellia 

 secunda. The seeds of many plants of this family are wholly destitute 

 both of spiral cells or of any other appendages possessing hygroscopic 

 properties, such for example as Acanthus mollis and ilicifolius, Diptera- 

 canthus erectus, and several species of Jiisticia and Eranthemum. Proc. 

 Linn. Soc., March 17 th, 1840. 



Harrison on Longitudinal Stria on Navicula Hippocampus. It is not 

 generally known, and indeed it has been denied by some, that there ex- 

 ist longitudinal striae in Navicula Hippocampus. In specimens of re- 

 cent Infusoria collected by me at Hull, several of this species are met 

 with, and the striae can be distinctly seen with a power of about 400 

 linear, especially if not mounted in Canada Balsam. Robert Harrison, 

 Hull, 6th of June, 1841. 



[We have examined the specimens sent by Mr. Harrison, and can 

 with him affirm that Navicula Hippocampus is beautifully striated from 

 end to end, at the same time among some of the specimens forwarded 

 in his first letter, we must confess such markings are not invariably met 

 with, and the lorica has every apppearance of not being so marked. 

 Perhaps this might be a sufficient character to form a species or at least 

 a variety upon. Editor.'] 



E. J. Quekett's observations on a certain Crystaline Matter found on 

 the recently, cut surfaces of the Wood of the Red Cedar. On the recently 

 cut surfaces of the Wood of the Red Cedar (Juniperus virginiand) a crys- 

 taline matter is observed to form, which puts on the appearance of a 

 mouldiness, but which, when viewed with a magnifying glass, is seen to 

 consist of innumerable extremely minute crystals of an acicular form. 

 The substance was observed to form on the duramen or heart- wood only, 

 and not universally but in patches. It is easily volatilized by heat, and 

 gives out the well-known odour of the wood. Mr. Quekett showed that 

 the duramen of the red cedar contains an abundance of a concrete volatile 

 oil, on which the peculiar odour depends, and that the crystaline sub- 

 stance is a compound formed between the air and the oil, for when the 

 latter was obtained from the wood, and exposed to the action of the air, 

 it was soon also found to be covered with the same acicular crystals. 

 This substance, which possesses many of the properties of benzole acid, 

 Mr. Quekett considers new, and he proposed for it the name of Ceda- 

 rine. Proc. Linn. Soc., March 3rd, 1840. 



