On the Progress and present State of Vaccination. 2S9 



dyke of gray lava. It appears about 30 feet higher, and 

 clips again to the westward. The substance of the red rock in 

 this place is hard, and it breaks into a columnar form, being 

 by far the most compact of the red strata I met with in the 

 island. I saw this red lava also in the island of Teneritfe, 

 to the eastward of Santa Cruz, as well as in the neighbour- 

 hood of Orotava. 



I have thus endeavoured to give you a slight sketch of that 

 which appeared to memostdeservingof attention in the island 

 of Madeira. The short stay I was able to make there pre- 

 vented a more accurate survey of the island; vet I saw 

 enough to induce me lo recommend a careful examination 

 of the strata to those who may have more time than 1 had 

 to spare, and more knowledge to estimate the value of that 

 which was to be seen. To mv mind, the most interesting 

 geological facts are: 1st, The intersection of the lava i)y 

 dykes at right angles with the strata. 2dly, The rapid dips 

 flic strata make, particularly the overlaying of that of tire 

 Brazen Head, to the eastward of f\inchal, where the blue, 

 gray, and red lavas are rolled up in one mass, and lie in a 

 pqsition as if thev had all slipped together from an upper stra- 

 tum. Sdly, The columnar form of the lava itself reposing 

 on, and being covered bv, beds of scoriae, ashes, and pu- 

 mice, which affords a strong argument for the volcanic 

 origin of the coluinns themselves : and 4thly, The veins of 

 carbonate of lime and zeolite, which are not found here in 

 solitary pieces as in the vicinity of ^Etna and Vesuvius, but 

 are amid the lavas and in the strata of pumice and tufa, and 

 are diffused on the lava itself^ and occasionally crystallized 

 jn its cavities. 



LUI. On the Progress and present State of the Practice of 

 Vaccination. By T. Bateman, M.D. 



1 HE objects which the general adoption of vaccine ino- 

 culation wdl accomplish for mankind,, if time and experience 

 shall confirm the promises of its benevolent discoverer, are 

 so important, that every friend of humanity must have fol- 

 lowed with anxious hope the progress of the practice, and 

 rejoiced at the general result of the evidence in its favour. 

 It is not easy, indeed, to calculate the sum of human misery 

 that will cease to exist, when the prospect which vaccina- 

 tion holds out to us shall be realized. In its casual, or 

 natural occurrence, as it is termed, the sniall-pox is not only 

 Vol. 38. No. IG'2. Oct. 181 1. T the 



