II. REGNERI De GRAAF, M.D. E PISTOL A, De non- 
nnllis circa Partes Genitales Inventis Novis> Lugduni Batav. in 
16. A % 1668. 
IIL §0H ANN1S Van HORNE, M.D. obfervationjum fa 
drum circa Partes Genitales in utroque fextt , PRODROMVS. 
Lugd. Batav. in 16. A. 166B. « 
It feemes, that the two Authors in thefe two Papers have 
met with almoft the very fame Obfervations which they ac- 
count New., about the Genitals in both Sexes \ and that, the for- 
mer having appeared in Print before the latter, the latter thought 
himfelf obliged, the felt" fame day that the Epiftleof De Graaf 
came out of the Prefs (as himfelf intimateth) to declare in this 
his Prodromus 3 that, though he knowes not, whether the Obfer- 
vations of the former be altogether the fame with his, yet, to avoid 
difpute hereafter, he thought fit, in this Paper cf his, toreprefent 
the fhort of his own un-borrowed Obfervations, concerning that 
Subjedj till he fhould be able to publifli a fall Hiftory of the 
ftru&ureof thofe parts. 
Touching De Graaf he i . R eje&s the opinion of thofe, that 
teach a Conjun&ion of the Seminal Arteries with the Veins by 
vifible Anajlomofes, and that reckon the Teflicles among G I an- 
nuls. 2. He amims, that he hath often unravelFd totamfubftm- 
tiam tefticulorum in ingentcm longitudinem. 3. He afferts to have 
fhe w'd by a fhort way 5 FeficuUrum [emmalium cum vafis defe- 
renttbus communionem y niagnitudinem, ftguram , e arum que in V- 
rethram exitnm. To which he faith to have added a very eafie 
way of examining the Body of the Pro(lat£, From the confide- 
ration of all which he concludes , Unam ejfe folummodo materian> 
feminis , eamque in teflibus gwerari, in ve(icult$ excipi^ & inde 
in Vrethram ejici^ non per unum y ut vult Veflingius, fed dm fo- 
ramina, 4. He affirmes to have an eafier and more accurate way 
of diff ding the Penis than any other Anatomifts he knows-, and 
that he affignes to the Mufcles thereof a tarr other ufe, than hath 
been done hitherto. Of all which he intimateth^ that ie is ready 
to publifli a Book,after he (hall have received the thoughts of Dr» 
Sylvius upon the Manufcript thereof. He concludes, that he 
hath contrived a New In(lrument 0 whereby every one may give 
him.felt a cfyfler without any Denudation of the parts, or change, 
of pofture a Con-. 
