The law of multiple proportions is largely obsolete these days because we all believe that atoms exist.  Prior to about 1900 this and similar laws were used to show that, for example, the ratio of oxygen in $\ce{CO}$ to oxygen in $\ce{CO2}$ is 2:1.

Of course that's trivially obvious when we write the formulas, but before we believed in atoms the "small whole number" ratios were used as an example of an experimental situation (the 2:1 ratio) could be explained by atoms (i.e. quantizing atomic masses.)

Today, the law causes more confusion than it cures.  Atoms are here to stay.

Law of Multiple Proportions: What is the significance of small whole numbers?
         string query = &lt;Where&gt; 
                           &lt;And&gt;    
                              &lt;And&gt;       
                                 &lt;And&gt;          
                                      &lt;Eq&gt;&lt;/Eq&gt;
                                      &lt;Eq&gt;&lt;/Eq&gt;
                                 &lt;/And&gt;
                                   &lt;Geq&gt;&lt;/Geq&gt;
                                   &lt;Leq&gt;&lt;/Leq&gt;
                              &lt;/And&gt;       
                                &lt;Eq&gt;&lt;/Eq&gt;
                           &lt;/And&gt;
                        &lt;/Where&gt;


In SharePoint foundation development, i have used this CAML query to query a SharePoint list. This query contains five conditions. After above query gets executed, it throws an Microsoft.Sharepoint.SPException exception. I tried but couldn't figure it out. Is there any mistake in above CAML query. Any help is appreciated.
