July  1,  189rj,]  Supplement  to  the  “ Tropical  Agriculturist.” 
73 
to  dissolve  the  slaked  lime  and  mix  it  -with  the 
sand  lias  been  evaporated,  the  water  of  combina- 
tion has  gradually  to  be  given  up,  and  the  slaked 
lime  become  converted  into  carbonate  of  lime.  It 
is  sometimes  found  even  in  old  walls  that  the 
internal  plaster  contains  slaked  lime  in  the  un- 
altered condition. 
It  may  be  said  that  water  acts  in  three  ways 
in  relation  to  lime,  (1)  it  combines  chemically 
with  it  to  form  the  hydrate  of  lime,  which  we 
have  agreed  to  call  slaked  lime,  and  (2)  it  partially 
dissolves  this  slaked  lime,  so  forming  what  is 
commonly  known  as  limewater — a solution  of 
.«laked  lime  in  water,  and  (3)  it  acts  as  a medium, 
a mechanical  medium  we  may  say,  for  mixing 
slaked  lime  and  sand. 
Carbonate  of  lime  is  insoluble  in  pure 
winter,  but  is  soluble  in  water  having  carbonic 
acid  gas  in  solution  ; this  can  be  easily  proved. 
If  we  take  some  lime  water,  prepared  by  dis- 
solving slaked  lime  in  water,  and  breathe  into 
this  solution,  w-e  pass  into  it  carbonic  acid  gas, 
which  is  contained  in  our  expired  breath.  I cannot 
here  say  more  in  explanation  of  how  this  gas  comes 
to  be  found  in  our  breath,  than  merely  mention 
that  it  results  from  the  oxidation  in  the  luti2s  of 
the  waste  carbonaceous  materials  found  in  the 
blood.  IVell,  by  breathing  into  this  solution  the 
carbonic  acid  gas  combines  with  the  quicklime 
part  of  the  disolved  slaked  lime  and  so  forms 
carbonate  of  lime.  The  change  is  similar  to  that 
which  1 stated  took  place  in  the  hardening  of 
mortar,  namely,  the  conversion  of  slaked  lime  into 
carbonate  of  lime,  by  the  combination  of  quick- 
lime with  the  carbonic  acid  gas  in  the  atmosphere 
Both  changes  are  representable  by  the  same 
chemical  equation 
C'aO,  HjO  + COj  = CaO,  CO^-tllO,. 
Now  you  will  observe  that  the  liquid  turns 
milky,  the  reason  of  this  being  that  particles  of 
carbonate  of  lime  which  has  been  formed  are  in 
suspension  in  the  water,  since  carbonate  of  lime  is 
insoluble  in  water.  If,  however,  we  continue  to 
supply  carbonic  acid  gas  to  this  mechanical 
mi.xture  of  carborate  of  lime  and  water,  we  shall 
find  that  the  liquid  again  becomes  colourless, 
owii'ig  to  the  fact  that  carbonate  of  lime  is  soluble 
in  water  which  contains  carbonic  acid  gas  in 
solution. 
{To  be  continued^) 
♦ 
CEYLON  WOODS. 
The  timber  trees  of  Ceylon  have  been  ably  dealt 
with  by  the  late  Mr.  ‘William  Ferguson,  and  his 
pamphlet  on  the  subject  has  served  as  a useful  hand- 
book to  the  students  of  plant-life  in  Ceylon,  but 
we  venture  to  think  that  the  following  list  of  the 
trees  of  our  forests  which  are  of  economic  value 
will  prove  of  interest  to  our  readers,  especially  as 
specimens  of  the  wood  from  these  trees  can  be  seen 
at  the  School  of  Agriculture.  The  collection  was 
made  by  the  Conservator  of  Forests  himself  who, 
with  the  permission  of  Government,  presented  it 
to  the  School  Museum.  The  numbers  in  italics 
indicate  the  numbers  of  the  orders  in  Dr.  Trimen’s 
list  of  Ceylon  Plants,  those  within  brackets  being 
the  numbers  of  the  specimens  themselves.  The 
Sinhalese  names,  where  known,  are  also  given: — 
2  Dilleniacere. 
(1)  W'onnia  trir|uctra.  Diap.ar.a. 
(2)  Dillenia  retnsa.  Godapara. 
3 Magnoliacese. 
(3)  Michelia glanca.  Wal-.sapu,  "Wal-buruta. 
(4)  Michelia  champaca.  Sapu  (Champak). 
4 Anonace.'c. 
(5)  Cyatliocalyx  zeylanicns,  Kekala,  Ipetta. 
(6)  Polyalthia  cotfieoides. 
(7)  Xylopia  parviflora.  Netawn. 
9 Capparidere. 
(8)  Crataeva  lioxburghii.  Lunuwarana. 
11  Bixine.'B. 
(9)  Scolopia  crenata.  Katukurundu,  Katukenda. 
(10)  Trichadenia  zeylanica.  Titta-gas,  Tolol. 
(11)  Hydnocarpus  venenata.  Makulu. 
Id  Guttiferm. 
(12)  Gai  cinia  echonicarpa.  INfadol. 
(13)  ,,  spicata.  Ela-gokatu. 
(14)  Calophyllum  sjrectabile.  Doinba-kina. 
(15)  ,,  Biu’inanni.  Guru-kina. 
(16)  ,,  Inophyllum  Domba. 
(17)  ,,  tomentosum.  Kina. 
(18)  ,,  bracteatum.  Walu-kina. 
(19)  Mesuaferrea. — Na  (iron  wood). 
20  Ternstroeiniacere. 
(20)  Ternstroeinia  emarginata. 
(21)  Adinaiidra  lasiopetala. 
(22)  Gordonia  zeylanica. 
21  Dipterocarpacem. 
(23)  Dipterocai-pus  zeylanicu.s.  Hora. 
(24)  Vatica  Koxburghiana.  ‘ Mendora. 
(25)  ,,  affinis. 
(26)  ,,  obscura. 
(27)  Shorea  lissophylla. 
(28)  Hopea  discolor. 
(29)  ,,  cordifolia. 
(30)  Doona  trapezifolia.  Yaka  halu. 
(31)  ,,  gardneri. 
(32)  ,,  macrophylla.  Honda-heraliya. 
(33)  ,,  ovalifolia. 
(34)  Vateria  acuminata.  Hal 
(.35)  Stemonoporus  sp. 
22  Malvaceae. 
(36)  Thespesia  populnea.  Suriya  (tulip  tree.) 
(37)  Bombax  malabaricum.  Katu-imbul  (red 
cotton  tree). 
(.38)  Cullenia  excelsa.  Katu-boda.  (Wild  durian.) 
23  Sterculiacem. 
(39)  Stercnlia  foetida.  Telambu. 
(40)  Pterosperinum  suberilolium.  ‘V'elanga. 
2Jf  Tiliaceaj. 
(41)  Pityranthe  verrucosa. 
(42)  Berrya  ammonilla.  Hal-milla  (Trincomalee 
wood). 
(43)  Grewia  orientalis. 
(44)  ,,  tiliadolia.  Daminiya. 
(45)  Ehucarpus  serratus.  Weralu  (wild  olive). 
(46)  Eheocarpns  amcenus. 
(47)  ,,  snbvillosns.  Gal-weraln. 
(48)  ,,  zeylanicus. 
(49)  ,,  glandulifer. 
29  Rutacem. 
(50)  Acronychia  laurifolia.  Ankenda. 
(51)  Atalantia  monophylla. 
(52)  ,,  zeylanica.  Yakinaran. 
(53)  ,,  missionis.  Pamburu. 
(54)  F'eronia  elephantum.  Diwul  (wood  apple). 
(5  >)  Citrus  aurantium.  Dodan,  (orange). 
30  Siinarubacere. 
(56)  Ailantns  malabarica.  Knmbalu,  Wal-bilin. 
32  Burseraceoe. 
(57)  C.anarium  zeylanicum.  Kekuna. 
(58)  Filiciuni  decipiens.  Pehimbiya. 
33  Meliace.T}. 
(59)  Azadirachta  indica.  Kohomba. 
(60)  Melia  dubia.  Lunu-midella. 
(61)  W.alsura  piscidia.  Kiri-kon. 
(62)  Chickrassia  tabularis.  Hulan-hik. 
(63)  Cliloroxylon  swietenia.  Bunita  (Satinwood). 
