88 REVIEW. [March, 



In discussing the question de analogia embryi,the author states : 

 " Sed sive Monocotyleara formarum seriem proprium quendam 

 typum existimes, sive quorundam Dicotyleorum typorum inferio- 

 rem quendam evolutionis gradum, errare mihi videtur, si quis 

 statuit quodcumque embryon quod thalloideam quandam offerat 

 formam, id cum Monocotyleis affinitatem quandam significare/' 

 He concludes that in certain cases it is impossible to judge from 

 the embryo whether the plant be related to Monocotyledons or 

 to Dicotyledons. 



This chapter is ended with an inquiry into the plants which 

 have the highest development^ and he concludes that the Synan- 

 thera, the primary Order in Priests classification^ should not stand 

 first. In the two succeeding paragraphs there is a condensed view 

 of the substance of this long and important chapter.^ 



The last chapter of this learned and scientific introduction to 

 the study of the Natural Orders is entitled, "De vi et varietate 

 Ordinum Naturalium.^' 



The author's classification or arrangement of the Orders is the 

 following : — 



1. PlantcB sporogamm (Agamce?). Comprehending^/^«. ("Cha- 

 raceas Siphonearum seriem concludere, mihi probabile est.'') 

 Several systematists have assigned them a higher rank. In this 

 section, or under the Sporogamous type, both Lichens and Fungi 

 are included. 



* " Caeterum quod floris structiiram attinet, jam in pi'Deccdente paragrapho docui, 

 quse mihi visa sunt evolutionis diversa stadia : itaque illud sumo, numero temario 

 inferiorem evolutionis gradum signiflcari quam quinario ; quo intra florem majus 

 expansus est axis, eo minus perductam metamorpliosin, itaque inferiorem indicari 

 evolutionis gradum, probabile esse ; ergo eimi florem, cujus partes spiraliter dispo- 

 sitse sunt, verticiUato flore imperfectiorem esse, itemque polypetalum gamopetalo 

 imperfectiorem ; atque pari modo fructmn carpellis spiraliter dispositis et numero- 

 sis constantem eo imperfectiorem esse, qui carpellis constat verticillatis, quemad- 

 modum distincta carpeUa minus perductam metamorphosin quam coalita signifi- 

 cent ; denique atropam gemmulam imperfectiorem esse anatropa, et id embryon, 

 cujus partes non evolutse simt, eo imperfectius esse, cujus smit distinctse cotyle- 

 dones et plenje evolutse. 



" Vix denique nobis sit nionere, non propter unius partis perfectionem — si cseterse 

 imperfecta} sunt — locus aut superior aut inferior Ordini cuidam tribui debere ; ut 

 enim in omni, ita in liac re, uuiversse vitse ratio est habenda, eaque forma perfec- 

 tissima existimanda, qase omnes simul partes perfectissimas liabet. Neque, credo, 

 possit dubitari, quin, quum numerosissimse siat phanerogamarum series analogse, 

 non in ima quadam speciali formee perfectissiaiee qugerendse sint, sed liceat in mul- 

 tis et diversis seriebus formas geque fere perfectas expectare." 



