SU.MM.ARIES OF E.VST RIDING PLANTS. 45 



7. Intermediate Type. — Specie.s having their heaihiuaiters in tlie south 



of Scotland and north of England. 



8. Local Type. — Species very nnich restricted in range, occurring in 



Britain in, saj-, one or two places onlj'. 



Tabulated a.s under, the East Riding records of species 

 according to the above-named types of distribution, we have 

 the following result : — 



British Type 



English Type 

 Germanic Type ... 



A tlantic Type ... 



Highland Type ... 

 Scottish Type 

 Intermediate Type 

 Local Type 



Total 



Aliens, Casuals, &c. 

 1 ncognita ... 



Grand Total for East Riding ... 103.') 



From the above table, and from what has been said 

 previously, we may gather that the very oldest vegetation 

 are most probably those nineteen plants of the Scottish type, 

 together with a great number of those of the British type, 

 which would follow closel)' in the wake of the snowline and 

 iflacier as they do northwards to-day. The 272 plants of 

 the English t3p.e, as the}' are well represented in more 

 southern England, and are gradually diminishing north- 

 wards, may be considered as spreading or moving in that 

 direction ; but not having become so widely distributed as 

 those of the British type, they give indications of their later 

 immigration ; and the same is probably the case with the 

 plants of the Germanic type. It will, we think, be found 

 that the percentage of plants of the English t3pe, which in 

 their northward march have their last halting place in the 

 East Riding, is somewhat high. Both English and Germanic 

 types give a decidedly more recent facies to our flora, and 

 this is intensified by the recent introduction of so many 

 aliens, casuals, &c. Incidentally in this connection it may 

 be mentioned that from a careful comparison of the flora 

 of the East Riding with that of Friesland and the Frisian 

 Islands (north of Holland), in the same latitude but separated 

 by four hundred miles of German Ocean, there is a striking 

 general similarity between the two ; and this is what might 



